Bell

Details Bell Bell

1993-10-18

1995-01-10

Gandy, James M.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03542475

REFERENCES:
patent: D133738 (1942-09-01), Katz
patent: D331720 (1992-12-01), Shyan
patent: D338167 (1993-08-01), Huang
patent: D342915 (1994-01-01), Shyan

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